TOP 15 Engineering Mechanics Questions & Answers

1. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

A True B False

Answer: Option B

2.The friction experienced by a body, when in motion, is known as

A rolling friction B dynamic friction C limiting friction D static friction

Answer: Option B

3. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity

A v B v/2 C v/4 D v/8

Answer: Option B

4. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.

A Agree B Disagree

Answer: Option A

5. The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

A equal to B less than C greater than Answer: Option A

6. The total time taken by a projectile to reach maximum height and to return back to the ground, is known as time of flight.

A Yes B No

Answer: Option A

7.The range of a projectile is maximum, when the angle of projection is

A 30° B 45° C 60° D 90°

Answer: Option B

8. Which of the following is an equation of linear motion?(where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)

A v = u + a.t B s = u.t + 1/2 a.t2 C v2 = u2+2a.s D all of these

Answer: Option D

	9. If a number of forces are acting at a point, their resultant will be inclined at an angle θ with the horizontal, such that
	A tan θ = ∑H/∑V B tan θ = ∑V/∑H C tan θ = ∑Vx∑H

  Answer: Option B

10.A smooth cylinder lying on its convex surface remains in __________         equilibrium.

A stable B unstable Answer: Option B 11. Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies. A Yes B No Answer: Option A 12.Moment of inertia of a circular section about an axis perpendicular to the section is A πd3/16 B πd3/32 C πd4/32 D πd4/64 Answer: Option C

13.The unit of angular acceleration is

A N-m B m/s C m/s2 D rad/s2

Answer: Option D

14.The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is

A sin θ B cos θ C tan θ D cosec θ

Answer: Option A

15. The range of projectile on a downward inclined plane is __________ the range on upward inclined plane for the same velocity of projection and angle of projection.

A less than B more than C equal to